Fix BitmapPlatformDevice::DrawToContext handling of NULL src_rect on Mac
Fix BitmapPlatformDevice::DrawToContext handling of NULL src_rect on Mac

BUG=none
TEST=Crash/kill a plugin process on the Mac; sad tab should draw in the right place.

Review URL: http://codereview.chromium.org/155958

git-svn-id: http://src.chromium.org/svn/trunk/src@21349 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: c98ad378a29db4fa1a293bbd1f1b2171e50c227e
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser